Thermostatic fire-alarm.



H. H. CAMP.

THERMOSTATIC FIRE ALARM.

APPLICATION FILED JAN.4. 191s.

1,283,660. P tented NOV. 5, 1918' g6 \l:\\\\ \\\\:\\m; 2:27. 22$ 96/] l I: H llllllll 27 j WITNESSES INVEN TOR ,4 TTORNEYS HARRY H. CAMP, 0F SPENCER, WEST VIRGINIA.

THERMOSTATIC FIRE-ALARM.

Specification of Letters Patent.

Patented Nov. 5, 1918.

Application filed January 4, 1918. Serial No. 210,291.

To all whom it may concern:

Be it known that I, HARRY H. CAMP, a citizen of the United States, and a resident of Spencer, in the county of Keane and State of West Virginia, have made certain new and useful Improvements in Thermostatic Fire-Alarms, of which the following is a specification.

My present invention relates generally to thermostatic fire alarms, and more particularly to a thermostatic member for use in connection with electrical alarms of fire and other types, my object being the provision of athermostatic circuit making alarm member which willbe at once simple in construction and strong and durable in use.

In the accompanying drawing, illustrating my present invention Figure 1 is a front elevation of the alarm indicator illustrating in diagram the electrical alarm connections thereof; v

Fig. 2 is a rear or inner face view of the dial; 1

Fig.3 is a vertical cross section through the alarm indicator taken substantially on line'33 of Fig. 1, and,

Fig. 4 is a detail perspective view of one of the contact fingers removed.

Referring now to these figures my invention purposes the use of a thermostatically controlled indicating .pointer 10, which is plainly seen in Fig. 1, and has its efiective or indicating end movable across an arcuate dial 11, the latter graduated as deemed suitable for temperatures. The pivot pin or stem 12 of this indicating pointer is mounted through a flat dial plate 13, the latter vsecured withln an annular casing 14; and preferably covered and protected by a transparent cover plate 15, as seen in Fig. 3, the lat ter supported by a rim 16 frictionally engkaging and supported upon the casing 14.

the rear of the dial plate 13, and as plainly seen in Fig. 2, the pivot pin or stem 12 is mounted in a bracket 17 and connected to an expansible and contractible metal helix 18, action of which moves the pointer 10 in order to cause the latter to properly traverse the dial 11, as usual in temperature indicators.

Beyond the dial 11 the dial plate 13 is in further accordance with my invention provided with an arcuate slot which extends the full length of the dial, at a point beyond the outer or effective end of the indicator 10 so as to obviate interference in the action of the latter, and for purposes which will be presently described as well as for the reinforcement of the dial plate 13 slotted as described I secure an arcuate contact strip 19 upon the rear face of the dial plate, as best seen in Fig. 2, having an arcuate slot 20, which registers with the slot 21 of the dial plate. This contact strip 19 is secured at its opposite ends to the dial plate by fastening'members as at 22, and is of any suitable conducting material as distinguished from the dial plate 13, which latter is of non-conducting material. Adjustable in the registering slots 20 and 21 are clamping posts 23 including bolts and nuts, which serve to adjustably secure contact fingers 24 upon the outer surface of the dial plate 13 through the openings 25 of which, as seen in Fig. 4, the bolts extend, thenuts of the clamping posts being seated in the recessed endsof the said fingers, the

latter of which are adapted to project across the dial, 11, and therefore in the path of movement of the indicator 10.

My improved alarm member as thus constructed is capable of effective and durable use in connection with various external indicating means, and while it is not desired to limit its scope in any respect it may be utilized with an electrical circuit including wires 26 and 27 leading from an alarm member such as for instance a bell 28, one of which includes a battery 29 or other source of current, these wires leading to binding posts 30 mounted upon the upper portion of the casing 14 and provided with internal extensions 31, one of which is seen in Fig. 3, in practice, respectively connected to the indicator 10, and one end of the contact strip 19. One, at least, of the binding posts 30 is insulated from the casing.

In this way either one or both of the contact fingers 24: may be utilized as upon contact with either thereof it is obvious the alarm circuit will be complete. If it is de- 100 sired to simply sound an alarm upon excessive increase of heat, but one of the contact fingers need be utilized at the right of the dial plate, while if sounding of the alarnris desired upon excessive lowering of te npera- 105 ture, but one of the contact fingers need be positioned at the left of the dial plate. On the other hand if it is desired to sound an alarm whenever the temperature increases above or decreases below previously deter- 110 mined points, the two contact fingers are placed at spaced points with the indicator 10 between them. Y

It is obvious that in my construction wherein the fact that it is necessary to slot the dial plate, is in itself a disadvantage as regards strength and durability certain ad-- vantages are obtained, including the free adjustability of the contactfingers throughout the length of the dial, and that the disadvantage mentioned is counteracted to a considerable extent by the presence of the contact strip 19, portions of which extend along the dial plate at opposite sides of its slot with its reinforcing qualities. It is further more obvious that by the construction described I am enabledto provide an arrange ment of the present type in which the. several parts may be mounted upon the rear or inner face of the dial plate and therefore concealed from view except the indicating fingers 24; and the outer ends of the clamping posts 23.

I claim In an alarm indicator of the character described, the combination with a thermostatically controlled indicator and a dial plate on which the said indicator is mounted to move having a dial traversed by the effective end of said indicator, said dial plate having a slot concentric with the dial and 'arran ed at a point therebeyond and beyond the e ective end of the indicator, of a contact strip secured upon the rear face of the dial and having a longitudinal slot registering with the slot of the dial plate, clamping posts extending through registering slots of the dial plate and said contact strip, and contact finers adjustably secured by said contact posts and movable with thelatter throughout the length of the said registering slots, said contact fingers being disposed upon the outer or front face of the dial plate and projecting over the dial and into the path of movement of the efi'ective ends of said indicator.

HARRY H. CAMP. Witnesses J. P. PRICE, H. B. S'IYA'I'NAKER. 

